Drop-hammer



(N70 Model.) l 3 Sheets- Sheet l. F. LOMBARD.

Y DROP HAMMER.

No. 576,273. Patented Feb, `2, 1897.

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` 3 Sheets-Sheet 2. P. LOMBARD.

. DROP HAMMER. I A No. 576,273. Patented m. 2, 1897- -(No Model.)V 3 Sheets-Sheet 3.

P. LOMBARD. DROP HAMMER.

DIO-576,273. l Patentedpeb. 2,189?.

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UNrrnn STATES APATENT OFFICE.

FRANK LOMBARD, OF HARTFORD, CONNECTICUT.

DROP-HAMMER.

SPECIFICATION forming part of Letters Patent No. 576,273, dated February 2, 1897'.

Application iiled October 6, 1896.

To rrZZ whom t may oon/cern.- Be it known that I, FRANK LOMBARD, a citizen of the United States, residing at Hartford, in the county of Hartford and State of Connecticut, have invented certain new and useful Improvements in Drop-Hammers, of which the following is a specification.

My invention relates to drop-hammers of the class in which the hammer is lifted by the frictional contact of driving-rolls engaging a lifting-board; and it has for its object to provide improved means for clutching the friction-rolls in engagement with the liftingboard.

The improvement consists in the novel screw mechanisms for forcing the frictionrolls into contact with the board, and in the combination7 arrangement, and construction of parts, as hereinafter more fully described, and particularly recited in the claims.

In the accompanying drawings, forming a part of this specification, Figure 1 is a front elevation of the upper part of a drop-hammer embodying my improvements, and Fig. 2 is a side view of the same. Fig. 3 is a horizontal section on the line X X of Fig. 2, and Fig. 4 is plan view of the machine with the triprod and clutching-lever removed. Fig. 5 is a vertical section on the line y y, Fig. 3.

Referring to the drawings, A designates the uprights or frame of the drop-hammer, which are adapted to support the head B, secured thereto in any well-known or suitable manner. To vertical projections b b2 on the front and rear parts of the head are secured the caps D by pins CZ, as shown, or by any other desired means. The caps, with the head, form horizontal spaces or ways E, in which the boxes or bearings F F of the shafts G Gr are arranged and adapted to slide.

The shafts support the friction-rolls II I-I between the boxes, and the friction-board I, attached to the hammer J, is passed between the rolls in the usual manner. The boxes of the rear rolls H are held stationary in the ways E by means of the screws h2, which are journaled in the projections b', having collars 713714130 prevent end play, and are screwed into the hubs h5 on the rear sides of the boxes. The collar h4 is pinned or otherwise removably fastened on the screws to permit the asn` Serial No. 608,019. (No model.)

sembling of .the screws in place, but the collar h3 is preferably formed integrally with the screw, as it receives the strain of the clutching mechanism. Said screws are adapted to hold the boxes stationary and also to adjust them when required, the rotation of the screws serving to move the boxes toward or away from the friction-board.

Upon the front sides of the forward boxes F are bolted the nuts f', formed with internal threads, which are preferably double, as shown. Said nuts receive the screws L, having the double threads Z Z2, a half-convolution of each thread being provided, as shown. The screw of the left side of the machine, which is the left side of Fig. l has a left-hand pitch, and the screw at the right side has a reverse or righthand pitch, as shown in Fig. 3. The shafts or cylindrical parts Z3 of the screws are journaled in the projections b2, and collars Z4 are integrally formed thereon and in juxtaposition to the inner sides of the projections to receive the thrust of the strain on the boxes when the rolls are in clutched engagement with the friction-board.

On the outer ends of the screw-shafts ES are secured the levers or rock-arms m, having split hubs mf keyed upon the shafts and also tightly clamped in place by the screws m2, passing through the flanges m3 of the hubs. Said hubs serve as collars to prevent the end play of the shafts and receive the thrust in the opposite direction from that of the collars Z4. Thus secured against longitudinal motion the rotation of the screws will move the boxes F toward or from the plane of the friction-board. As the pitch of the screws is in opposite directions and the levers m extend toward each other, the raising of the levers will consequently move the boxes and friction-roll away from the opposite roll, while the downward movement of the levers will force the boxes inward and clutch the friction-roll upon the friction-board.

To the front side of the machine, on one of the uprights, suitable bearings n are secured, inwhich is guided a vertical trip-rod R, having its upper end formed in a leaf or web r in juxtaposition to the ends of the levers m. Pins r2 are riveted therein and received in slots m4 in the ends of the levers m. An ad IOO j ustable dog T is secured on the trip-rod, projecting into the plane of the hammer, and thereby adapted to lift the rod by the upward movement of the hammer, as shown. The hammer is provided with the usual catch t for being held at the upward limit of its travel by engagement with the ordinary latch or pawl u, pivoted to the upright in the usual manner. The parts of the clutching mechanism are shown in the position intermediate of the limits of their travel in all the drawings.

Constructed as above described and shown, the operation of my improved clutching mechanism is as follows: By means of its weight the trip-rod R, when unsupported by any mechanism and free to drop, will swing the levers m downward by engagement of the pins r2 with the slots m4 in the ends of the levers. Such vibration of the levers will partially rotate the screw-shafts Z3, which, being Secured against end play by the collars Z4 and hubs m', will therefore, by turning in the nuts f', force the boxes F inward toward the opposite boxes, thereby carrying the frictionroll Il inward and thus clamping the friction or lifting board I between the rolls. The revolutions of the rolls by their drivin g-pulleys will lift the board and hammer until the hammer engages the dog T and lifts the trip-rod, as shown in the figures. The lifting of the trip-rod turns the screw-shafts Z3 in the direction opposite to that which takes place on the fall of the rod, and consequently screws the boxes F outward and removes the frictionroll from contact with the lifting-board, thus allowing the hammer to fall when permitted by withdrawal of the latch u from under the catch t' in the ordinary operation of machines of this class.

The mechanism whereby the movement of the hammer, its blows, and its automatic or independent actions are controlled, and treadle mechanism, forms no part of this invention, and here requires neither to be shown nor described. These mechanisms may be of any well-known or usual design.

The clamping action of this improved mechanism is very powerful, and the friction due to the large surfaces of eccentric and similar devices is avoided. The thrust due to the clutching strain is received upon the collarll, which is an integral part of the shaft, and therefore the parts cannot become displaced or out of order. The only strain received upon the hubs m tending to slip them endwise is that caused by the mere friction of the boxes in being pulled outward away from the opposite boxes by the screws L.

All the parts of the head and the clutching mechanism are of suitable design, cheap in construction, and very strong and durable, and may be readilyassembled or taken apart, but are not liable to become out of order or to shake loose.

I claim as my invention and desire to secure by Letters Patent- 1. In drop-hammers, the combination of the head or frame, a hammer and friction-board, a pair of friction-rolls, boxes supporting the shafts of the rolls, and mounted in the head or frame, one of said rolls and its boxes being movable horizontally in the frame, a pair of screw-shafts journaled in the frame or head secured against end play therein, and having their inner ends screw-threaded, nuts formed or secured upon the boxes, having the threaded ends of the screw-shafts screwed therein, levers secured upon the ends of the screwshafts, a trip-rod mounted upon. the frame, and engaging the said levers by a pin-andslot connection, whereby the vertical movement of the rod is adapted to move the friction-roll and its boxes horizontally in the head, substantially as and for the purpose speciiied.

2. In drop-ham mers, the combination of the head or frame, a hammer and friction-board, a pair of friction-rolls, boxes supporting the shafts of the rolls and mounted in the head or frame, one of said rolls and its boxes being movable horizontally in the head or frame, a pair of screw-shafts journaled in the frame at right angles to the shafts of the rolls, and secured against endwise movement in their bearings, screw-threads formed upon the inner ends of the screw-shafts, each of said screws having its pit-ch in the opposite direction to that of the other, nuts secured upon the said movable boxes and receiving the threaded ends of the screws, levers secured upon the outer ends of the screw-shafts, and extending toward each othera trip-rod guided on the frame and pivoted or connected to the outer ends of said levers, and means for elevating the trip-rod by the action of the hainmer, substantially as and for the purpose specified.

In drop-hammers,the combination of the head or frame B, uprights A, hammer J and friction-board I, the boxes F, mounted in the head, and the boxes F mounted in the head and movable horizontally therein, frictionrolls having their shafts journaled in said boxes, the screw-shafts Z3 journaled in the head-frame, and secured against endwise motion therein, and screw-threaded at their inner ends, the threads of cach screw having their pitch opposite to that of the other, the nuts f secured to the boxes F, the levers m secured upon the outer ends of the boxes, the trip-rod R pivoted to the ends of said levers, means for elevating said trip-rod by the action of the hammer, and latch mechanism for holding the hammerin elevated position, substantially as and for the purpose specified.

FRANK LOMBARD.

Nitnessesz GEORGE L. BARNEs, CHAs. E. MAYNARD.

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